My hopes and aspirations were pretty pedestrian: the first thing that came to me was "take the address on page1/client info, move it to page73/Form 8822 (notify IRS of change of address), and take the [external] new address to plug into page1."
  Sadly, the return still needs to be unlocked in order to get the new form to be recognized & printed, so it's not the one-click solution I had hoped for, but it's still an improvement over "type things out, again."

Robert
(I used the same alias here as on the Yahoo!Group for "LTUG/Lacerte Tax User Group".)